Fans join one of dozens of Dunder Mifflin branch offices scattered throughout the country, always set in medium-sized cities similar to those used in the real show, and each led by a Regional Manager. Due to overwhelming demand, the initial small number of branches was greatly expanded, and now virtual Dunder Mifflin branches can be found worldwide. When Dunder Mifflin Infinity 1.0 returned from its summer hiatus, Dunder Mifflin Infinity 2.0 was started, and the number of branches was scaled to 100, from across the US and Canada

Every week, Corporate assigns a new task to all employees, and branches collectively submit their entries. Tasks tend to be creative in nature. The "winner" of each task is determined by a vote of registered users.